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The adverse effect of the application of phosphorus (P) on arsenic (As) adsorption by soils can result in increasing mobility and availability of As. However, in different soils, P might influence As adsorption differently. In this study, the arsenate [As (V) ] adsorption capacities of six soils with different properties and the effects of P application were studied. The results indicated that the adsorbed As (V) contents all increased as a function of the As (V) content in equilibrium. When analysed using the Langmuir and Freundlich equations, the maximum As (V) adsorption capacity of 0.72 mg/g was found for an Alumi-Plinthic Acrisol, while the minimum capacity of 0.09 mg/g was observed for an Epigleyic Cambisol. The adverse effects of P application on As (V) adsorption by the six soils were observed to be variable. When the P/As molar ratio in a culture experiment was increased from 0 to 10, the maximal and minimal decreases in the As (V) adsorption capacity of 0.086 and 0.014 mg/g were found in the Alumi-Plinthic Acrisol and Epigleyic Cambisol, respectively. P was relatively more effective in competing for adsorption sites with As (V) in the Alumi-Plinthic Acrisol and Luvi-Endogleyic Phaeozem due to their higher A/P values (decrease in adsorbed As/added P) of 1.143 and 1.135, respectively. These results will help decrease the environmental risk of some Ascontaminated agricultural soils through the controlled application of P.

Phosphate has a differential influence on arsenate adsorption by soils with different properties